提出了一种基于三电平spwm调制的中点电压抑制方法，在改善输出波形质量的同时，有效的降低了IGCT过电压的危险。
A method of keeping neutral point potential balanced based on three-level SPWM had been brought forward, which can improve output waveform and decrease the possibility of IGCT's over-voltage.
动态范围达到60分贝。 电晕现象将受到抑制，饱和电平寄生信号可得到消除。
The dynamic range reached to 60 dB. The blooming is suppressed completely and the saturation-level shading can be removed.
在约束阵列孔径和阵元数的条件下，高效地实现了任意最小阵元间距约束下抑制峰值旁瓣电平(PSLL)的稀布阵综合。
Under the optimization constraints of the number of element, the aperture and the minimum element spacing, the MGA has been utilized to reduce the peak sidelobe level (PSLL) of the array.
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